Ignition coil



Jan. '12 ,1926. 1,569,756

v A,A.KENT

IGNITION COIL Filed May 5, 1922 ALZHLX nviizzffii BY My. (3M

1 ATTORNEY.

Patented Jan. 12,,1926.

1,56Q,756 PATENT OFFICE.

ARTHUR ATWATEE KENT, 0F ARDMORE, PENNSYLVANIA.

. IGNITION COIL.

Application filed May 3, 1922. Serial No. 558,239.

To all whom it may concern."

Be it known that I, ARTHUR A'rwArnR KENT, a citi'zen of the United States, residin in Ardmore, county of Montgomery, and tate of Pennsylvania, have invented certain new and useful Improvements in Ignition Coils, of which the following is a specification.

My invention relates to induction 0011s, and particularly those utilizable for producing sparks for igniting combustible charges in the cylinders or combustion chambers of internal combustion engines,

lily invention resides in an induction coil of the straight core or open magnetic circuit type disposed within a tubular or other casmg having one or-more end closures or'caps of metal against which directly abut some or all of the iron or other wires of the core to effect high heat conductivity More articularly, my invention resides in an in uction coil of the character above referred to utilizable in an' ignition circuit of the normally closed type, whereby, without the employment of external resistance, should the ignition circuit be left closed, the resultant heat generated within the induction coil structure will be conducted away and radiated with suificient ease and rapidity to prevent abnormal rise in temperature within the structure.

More particularly, my invention resides in an induction coil ofthe characters above referred'to in which the primary winding as is inside of the secondary winding.

. caps.

More articularly, my invention resides n an m uctioncoil of the characters above referred to in which the core and windings 'are positioned or held in place without recourse to tie rods, bolts or the like extending to the exterior'of the end closures or My invention resides in induction or ignition coil structure of the character hereinafter described andsclaimed.

For an illustration of some of the forms my invention may take, reference is to be had to the accompanying drawing, in which:

Fig. 1 is an elevational view'of an induction coil embodying my invention.

Fig. 2 is a vertical sectional view taken on the line 2-2 of Fig. 1. z

" Fig. 3 is a horizontalfsectional view taken on the line 33 of Fig. 1. 0

Fig. 4 is a fragmentary vertical sectional view-showingv a modified structure.

Fig. 5 is a diagrammatic view of a circuit arrangement to which my induction coil is adapted.

Referring to Figs. 1, 2 and 3, C is a simple straight core consisting of a bundle of iron wires, as well understood in the art. The core wires are held in a bundle by the SW)- rounding paper or fibre tube a upon which is wound, in one or more la ers, the primary coil or winding-P, of relativel few turns of.

preferably a substantially rigid unit in that the primary P is in fixed core C and the secondary tion upon the primary P.

A casin Iposition upon the 18111 nxed peer A, as a'tube oi fibre or other Q non-metallic or insulating material, has its lower end disposed between the upstanding flanges d and c on the metal cap or end closure f and base plate or1member g, re= spectively. The tube A may be ziorced be tweenthe flanges t5 and e and fit with-sel ficient irictionor snugness toreqnire no additional fastenin means. i

There is preferably poured infiuid state into the bottom of the casin A a suitable amount of insulatingmateria it, prefers? l3; cementitious, as asphalt, bituminous cement orequivalent, which upon coolin solidifies, hardens or sets. While the material it is still in fluid state, an induction coil unit, comprising the aforesaid as'sembl of core C and primary and secondary windings P and 55,515; introduced through the upper open end of the casing A, and the lower ends of the wires of the core. C are caused-to penetrate the 'fiuid it into direct or substantially direct or solidifies, it serves to hold the induction coil unit in place and prevent'its rattling or moving, under the continuous success1on of jars of a motor vehicle.

With the induction coil unit-so positioned within the casing A, asphalt or equivalent material j, similar to the material k, may be poured in fluid condition into the upper end ofthe casing A on top of and around portions of the induction coil unit, the same "hardening or solidifying to further support and hold the unit in fixed position with relation to the casing A. The upper end closure or cap 7: is then placed in the position indicated and secured by any suitable means, as pins m, to the casingA. As indcated, the cap k may have a flat or substantially flat portion n against which directly or substantially directly abut some or all of the wires of the core 0, whereby there is effected a contact of good heat conductivity, whereb additional heat is conducted to the cap and radiated thereby.

The inner end of the secondary winding S is connected to the outer end of the primary winding P, at 0, and a connection is made'from 0 to the metallic terminal p having a boss or projection g forced into the wall of the casing A or projecting into a depression in such wall. An eyelet or hollow rivet r securesthe terminal 72 to thecasing A, and connection from .0 is extended through the eyelet r and soldered or other wise connected thereto. The other terminal of the primary P connects by wire 8 to a similar metallic terminal t similarly. secured by eyelet to the casing A, the connection 8 being soldered or otherwise connected'to theeyelet or terminal 1%., a o I There is similarly secured-to the casing A,

at any suitable position, as substantially.

mid-way of its length, as indicated, athird metallic terminal u secured. by eyelet, to which is soldered the conductor v connecting with the outer terminal of the secondary winding S. Each of the terminals is provided with any suitable means, as a screww, for

binding, thereto a lead or conductor of the external circuit. p

These terminals are secured to the casing A'inadvance' of introduction of the coil unit thereintogand as the coil unit is intro- .duced, as above described, the connecting wires 0, s and 'v are passed through the eyelets in advance of fixing the coil unit within the casing A. Thereafter these connecting wires may be soldered to the eyelets or terminals. 4

While in Figs. 1 and 2 the cap is is shown as having a flat or substantially fiat portion a, such cap, may take the form indicated at w in Fig. 4, in which case the cap is bowed across the end of the core C, but nevertheless the core abuts directly-or substantially.

directly against the cap a.- for heat conduction purposes.

Fig. 5' indicates an ignition circuit of the normally closed type, with which my. induction coil is preferably, though not necesweaves sarily, employed. B is a battery or other source of current in series through the switch 3 with the primary P of the induction coil.

In the primary circuit are the stationar and terminal u connects to the rotary distributor D, which, as well understood in the art, rotates past the distributor terminals f connected to the spark plugs of the different cylinders of the internal combustion engine.

1 Should the engine stop with the cam e in such position that the contacts a and z are in engagement with each other, the primary circuit remains closed, if the operator should overlook opening the switch y. Un-

der such circumstances, current from' the battery 13 will continuetto pass through the primary P and cause evolution of heat therein. This heat is in part communicated to the core 0, which in turn communicates it to the end closures f and k, which radiate it or conduct it off to neighboring or contacting heat-conducting parts.

The extent and degree of heat conduction is such that the temperature of the primary P will not attain an excessive value notwithstanding the fact that there is no resistance in the primary circuit external to the primary P.

VJhiIe the caps or end closures f and k may be of steel or iron, it is preferred that they be of brass or other non-magnetic metal, since the employment of magnetic metal for the caps f and is, or either of them, increases the inductance or self-induction of the primary circuit and in some cases to extent undesirable as regards high speed operation of the interrupter mechanism comprising the contacts (1 ,2, as at high engine speeds.

What I claim is:

1. An ignition induction coil utilized in a closed circuit ignition system comprising a; casing of rigid insulating material, metallic end closures secured to said casing on opposite ends thereof, an induction coil unit in said casin held between said end closures and comprismg a central straight core of wires abutting against and confined between 2. An ignition induction coil utilized in a closed circuit ignition system comprising a casing of rigid insulating material, metallic end closures secured to said casing on opposite ends thereof, at least one of said end closures being non-magnetic, an induction coil unit in said casing held between said end closures and comprising a central straight core of wires abutting against and confined between said metallic end closures, a primary winding surrounding said core adjacent thereto, and a secondary winding, the contacts between the core wires and said end closures conducting away heat generated in said primary winding at a rate to prevent abnormal temperature rise of said primary winding.

3. An ignition induction coil utilized in a closed circuit ignition system comprising a casing of rigid insulating material, metallic end closures secured to said casing on opposite ends thereof, an induction coil unit in said casing held between said end closures and comprising a central straight core of wires abutting against and confined between said metallicend closures, a primary winding surrounding said core adjacent thereto,

heat generated in said primary win ing at a rate to prevent abnormal temperature rise of said primary winding.

4. An ignition induction coil comprising a casing of rigid insulating material, a metallic end'closure secured to one end of said casing on the exterior thereof, a second metallic end closure having a peripheral flange held to said casing by frictional engagement with the inner wall-0f said casing, and an induction coil unit in said casing comprising a central straight core of wires abutting at its opposite ends against said end closures in heat-transfer relation therewith, a primary winding surrounding said core adjacent thereto, and a secondary winding.

In testimony whereof I have hereunto affixed my signature this 27th day of April, 1922.

ARTHUR ATWATER KENT. 

